Geohash notifications (#288)

* mention notifications

* notifications

* warning

app/src/main/java/com/bitchat/android/ui/MeshDelegateHandler.kt

@@ -70,6 +70,9 @@ class MeshDelegateHandler(
             } else {
                 // Public message
                 messageManager.addMessage(message)
+                
+                // Check for mentions in mesh chat
+                checkAndTriggerMeshMentionNotification(message)
             }
             
             // Periodic cleanup
@@ -124,6 +127,48 @@ class MeshDelegateHandler(
         return privateChatManager.isFavorite(peerID)
     }
     
+    /**
+     * Check for mentions in mesh messages and trigger notifications
+     */
+    private fun checkAndTriggerMeshMentionNotification(message: BitchatMessage) {
+        try {
+            // Get user's current nickname
+            val currentNickname = state.getNicknameValue()
+            if (currentNickname.isNullOrEmpty()) {
+                return
+            }
+            
+            // Check if this message mentions the current user using @username format
+            val isMention = checkForMeshMention(message.content, currentNickname)
+            
+            if (isMention) {
+                android.util.Log.d("MeshDelegateHandler", "🔔 Triggering mesh mention notification from ${message.sender}")
+                
+                notificationManager.showMeshMentionNotification(
+                    senderNickname = message.sender,
+                    messageContent = message.content,
+                    senderPeerID = message.senderPeerID
+                )
+            }
+        } catch (e: Exception) {
+            android.util.Log.e("MeshDelegateHandler", "Error checking mesh mentions: ${e.message}")
+        }
+    }
+    
+    /**
+     * Check if the content mentions the current user with @username format (simple, no hash suffix)
+     */
+    private fun checkForMeshMention(content: String, currentNickname: String): Boolean {
+        // Simple mention pattern for mesh: @username (no hash suffix like geohash)
+        val mentionPattern = "@([\\p{L}0-9_]+)".toRegex()
+        
+        return mentionPattern.findAll(content).any { match ->
+            val mentionedUsername = match.groupValues[1]
+            // Direct comparison for mesh mentions (no hash suffix to remove)
+            mentionedUsername.equals(currentNickname, ignoreCase = true)
+        }
+    }
+
     /**
      * Send read receipts reactively based on UI focus state.
      * Uses same logic as notification system - send read receipt if user is currently